Personalized White Unicycle Irish Shamrock Toddler Long Sleeve T-Shirt. A white unicycle against an image of an Irish shamrock is a unique Irish gift design for bicyclists on birthdays and St. Patrick's Day. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.